<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<style>
    .bj{
        float: left;
    }
</style>
<body>
<div style="width: 590px;height: 400px;background-color: red">
    <div style="width: 180px;height: 200px;background-color: green" class="bj">左边</div>
    <div style="width: 180px;height: 170px;background-color: #e91e63" class="bj">中间</div>
    <div style="width: 180px;height: 140px;background-color: blue" class="bj">右边</div>
</div>
<div style="width: 700px;height: 500px;background-color: orange">footer</div>
</body>
</html>